feat: image variants engine

internal/infrastructure/config/imageVariantSettings.go

@@ -0,0 +1,44 @@
+package config
+
+import (
+	"fmt"
+	"strconv"
+)
+
+const (
+	EnvImageVariantMaxSourceBytes     = "IMAGE_VARIANT_MAX_SOURCE_BYTES"
+	DefaultImageVariantMaxSourceBytes = "10485760"
+
+	EnvImageVariantMaxSourcePixels     = "IMAGE_VARIANT_MAX_SOURCE_PIXELS"
+	DefaultImageVariantMaxSourcePixels = "50000000"
+
+	EnvImageVariantMaxConcurrentRenders     = "IMAGE_VARIANT_MAX_CONCURRENT_RENDERS"
+	DefaultImageVariantMaxConcurrentRenders = "4"
+)
+
+func imageVariantMaxSourceBytesFromEnv() (int64, error) {
+	raw := envOrDefault(EnvImageVariantMaxSourceBytes, DefaultImageVariantMaxSourceBytes)
+	value, err := strconv.ParseInt(raw, 10, 64)
+	if err != nil || value < 1 {
+		return 0, fmt.Errorf("%s must be a whole number of bytes greater than zero, got %q", EnvImageVariantMaxSourceBytes, raw)
+	}
+	return value, nil
+}
+
+func imageVariantMaxSourcePixelsFromEnv() (int64, error) {
+	raw := envOrDefault(EnvImageVariantMaxSourcePixels, DefaultImageVariantMaxSourcePixels)
+	value, err := strconv.ParseInt(raw, 10, 64)
+	if err != nil || value < 1 {
+		return 0, fmt.Errorf("%s must be a whole number of pixels greater than zero, got %q", EnvImageVariantMaxSourcePixels, raw)
+	}
+	return value, nil
+}
+
+func imageVariantMaxConcurrentRendersFromEnv() (int, error) {
+	raw := envOrDefault(EnvImageVariantMaxConcurrentRenders, DefaultImageVariantMaxConcurrentRenders)
+	value, err := strconv.Atoi(raw)
+	if err != nil || value < 1 {
+		return 0, fmt.Errorf("%s must be a whole number of renders greater than zero, got %q", EnvImageVariantMaxConcurrentRenders, raw)
+	}
+	return value, nil
+}

internal/infrastructure/config/settings.go

@@ -22,22 +22,25 @@ type AuthRateLimitSettings struct {
 }
 
 type Settings struct {
-	Environment        string
-	CorsAllowedOrigins []string
-	PublicURL          string
-	UploadDir          string
-	JWTSecret          string
-	DBFile             string
-	Database           DatabaseSettings
-	Storage            StorageSettings
-	DataDirPath        string
-	Port               string
-	Smtp               SmtpSettings
-	AuthRateLimit      AuthRateLimitSettings
-	TrustedProxies     []string
-	Version            string
-	UpdateFeedURL      string
-	Container          bool
+	Environment                      string
+	CorsAllowedOrigins               []string
+	PublicURL                        string
+	UploadDir                        string
+	JWTSecret                        string
+	DBFile                           string
+	Database                         DatabaseSettings
+	Storage                          StorageSettings
+	DataDirPath                      string
+	Port                             string
+	Smtp                             SmtpSettings
+	AuthRateLimit                    AuthRateLimitSettings
+	TrustedProxies                   []string
+	Version                          string
+	UpdateFeedURL                    string
+	Container                        bool
+	ImageVariantMaxSourceBytes       int64
+	ImageVariantMaxSourcePixels      int64
+	ImageVariantMaxConcurrentRenders int
 }
 
 func (s Settings) DataDir() string {
@@ -77,6 +80,21 @@ func NewSettingsFromEnv() (Settings, error) {
 		return Settings{}, err
 	}
 
+	maxSourceBytes, err := imageVariantMaxSourceBytesFromEnv()
+	if err != nil {
+		return Settings{}, err
+	}
+
+	maxSourcePixels, err := imageVariantMaxSourcePixelsFromEnv()
+	if err != nil {
+		return Settings{}, err
+	}
+
+	maxConcurrentRenders, err := imageVariantMaxConcurrentRendersFromEnv()
+	if err != nil {
+		return Settings{}, err
+	}
+
 	return Settings{
 		Environment:        os.Getenv("ENVIRONMENT"),
 		CorsAllowedOrigins: parseSemicolonSeparatedList(os.Getenv("CORS_ALLOWED_ORIGINS")),
@@ -99,9 +117,12 @@ func NewSettingsFromEnv() (Settings, error) {
 			MaxAttempts: authRateLimitMaxAttempts,
 			Window:      time.Duration(authRateLimitWindowSeconds) * time.Second,
 		},
-		TrustedProxies: parseSemicolonSeparatedList(os.Getenv("TRUSTED_PROXIES")),
-		UpdateFeedURL:  os.Getenv("UPDATE_FEED_URL"),
-		Container:      strings.EqualFold(os.Getenv("RENEWCMS_CONTAINER"), "true"),
+		TrustedProxies:                   parseSemicolonSeparatedList(os.Getenv("TRUSTED_PROXIES")),
+		UpdateFeedURL:                    os.Getenv("UPDATE_FEED_URL"),
+		Container:                        strings.EqualFold(os.Getenv("RENEWCMS_CONTAINER"), "true"),
+		ImageVariantMaxSourceBytes:       maxSourceBytes,
+		ImageVariantMaxSourcePixels:      maxSourcePixels,
+		ImageVariantMaxConcurrentRenders: maxConcurrentRenders,
 	}, nil
 }